Sawmill set-works.



No. 737,563. Y PATENTED smal, 1903.

R. P. BARKBR. SAWMILL SET-WORKS.

APPLIUATION FILED JUNE 2s, 190s.

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v PATENTED SEPT. 1, 1903.'

No. 737,563. A

' R. F. BARKER.

SAWMILL SET-WORKS.

APPLIOATION FILED JUNE 23, 1903.

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UNTTnD STATES Patented September 1, 1903.

PATENT OFFICE.

RUBEN F. EARKER, OF MARINETTE, WISCONSIN, ASSIG-NOR OF ONFLHALF TO MICHAEL OORRY, OFMARINETTE, VISCONSIN.

sAWM LL SET-WORKS.

SPECIFICATION forming part of` Letters Patent No. 737,563, dated September 1, 1903.

Application filed June 23,1903.

To all 'wh/0712 'H1 11mg/ concern:

Be it known that I, RUBEN F. BAKKER, a citizen of the United States of America, and a resident of Marinette, county of Marinette, 5 and State of Wisconsin, have invented certain new and useful Improvements in Sawmill Set-iVorks, of which the following is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

The invention relates to that type of sawmill set-works in which there is employed a motor having a piston reciprocating between positive stops and which motor is retarded by means of a check-cylinder containinga fluid, I5 such as oil, which is passed around a piston reciprocating in the cylinder through a bypass at each stroke of the motor-piston.

The object ofthe invention is to provide for the variable control of the by-pass, so that zo it shall be closed or partially closed toward the end of the stroke, thus increasing the retardation of the motor, while interposing less resistance during the middle of the stroke. This object is attained by the use of a valve z5 in the by-pass of the retarding or check cylinder, which valve is opened and closed by the action of the motor, and provision is made for relatively varying the action of the valve as the length of the stroke of the motor is 3o varied.

The invention is illustrated in the accompanying drawings, in Which Figure 1 is a pian view of the motor mechanism of a sawmill set-works. Fig. 2 is a side 35 elevation of the same, some of the parts being in section. Fig. 3 is a detail side elevation of the Inotoi mechanism, showing one form of the invention. Fig. 4 is a detail of the retarding-cylinder. Fig. 5 is a plan view 4o of a sawmill-carriage, and Fig. 6 is a detail of one of the connections.

There is shown in the drawings at l0 the r cylinder ofa reciprocating engine; at 11, a re tarding-cylinder arranged tandem with the 45 power-cylinder; at l2, the piston-rod, which is common to both cylinders; at 13, the crosshead of the motor provided with rack-gears; at 14, a segmental gear intermeshing with the rack of the cross-head and mounted upon a 5o rocker-shaft l5; at 16, the usual set-shaft of a sawmill-carriage; at i7, the pawi-earriors Serial No. 162,708. (No model.)

for cooperating with the ratchetewheel ordi-- narily carried by such a set-shaft; at 18, the link connecting one of the pawl-carriers with the rockenshaft l5, and at 19 the knees of 55, the sawmill-carriage with which the set-shaft 16 is in geared connection, as usual.

The retardingcylinder Il is provided with a by-pass (shown in Fig. i) connecting its two ends, and in this by-pass there is located 6o a two-way rocker-valve 20, controlled by means of a crank-arm 2l, which in the pre ferred form of construction illustrated in Fig. 3 is actuated from the cross-head 13 through the medium of a rock-lever 22, pivu 6r; oted to the cross-head at 23 and connected with the crank-arm 21 by means of a link 24, the rock-lever 22 being pivoted at 25 to a link-bar 2G, which is pivoted at 27 to a iixed part, as the cylinder 11, and is pivotally con- 7o nected with the usual stop-lever 28 by means of a block 29, which is in sliding engagement with the link-bar 2G through the medium of a loop 30.

The rock-lever is curved to an arc, of 75 which the link-bar 26 is a radius, and is slot ted, so as to slide upon the pivot-pin 23. The link 24 is in pivotal engagement with the rock-lever 22 through the medium of a yoke 3l, adapted to be fixed to the rock-lever and 8o provided with the pivot 32 for the engagement ofthe link.

The stop-lever 28 is of the Well-known form and projects across the path of the crosshead 13 and may be adjusted so as to vary 85 the stroke of the motor-piston. As it is swung about its pivot it raises and lowers the link-bar 26, and with it the rock-lever 22, thereby moving the center about which this rock-lever oscillates relatively as to the pivot- 9o pin 23, by means of which the lever is oscillated, thereby varying the throw of the lever relatively as to the range of movement of the cross-head, and thus maintaining a uniform movement of the valve 2O whatever may be 95 the stroke of the motor. This variation between the stroke of the motor and the throw of the valve 2O may be worked out in various ways-as, for example, by means of the construction illustrated in detail in Fig. 2 and roo disclosed also in Fig. l.

In this form oi coustrixction the connection between the cross-head 13 and the link 24, by means of which the valve is actuated, is through the medium of a rock-lever 33, swinging about a pivot v34, fixed in the frame of the motor, the rock-lever 33 being connected with the cross-head by a link 35. The link 24 is pivoted to a block 36, which is in sliding engagement with the rock-lever 33, and thisvthe cross-head and providing for maintaining a uniform action of the valve, though the stroke of the motor be varied. In this irl-v stance also the rock-lever 33 is curved to an arc and its radius is the link-bar 24, so that thev movement of the block 36 longitudinally upon the rock-lever 33 does not eiiect any` movement of the valve. While the centers of oscillation of the rock-lever 33 and the link 38 are not identical, there is solittle difference between them and the pivot-pins connecting the link 24 with said block and link move through so nearly similar arcs that no cramping occurs.

I claim as my invention l. In a power-actuated set-works for sawmills, in combination, a motor having a variable stroke; a retarding device comprising a cylinder having a by-pass Vconnecting the ends of its chamber, a valve in the by-pass, and a piston reciprocating in the cylinder and operatively connected with the motor; and adjustable operative connection between the motor and the by-pass valve.

2. In a power-actuated set-works for sawmills, in combination, a motor having a variable stroke; a retarding device comprising a cylinder having a ley-pass connecting the ends of its chamber, a valve in the by-pass, and' a piston reciprocating in the cylinder and operatively connected with the motor; adjustable operative connection between the motor and the by-pass valve; and means for adjusting such connection to maintain a uniform throw of the valve though the motorstroke be varied.

3. In a power-actuated set-works for sawmills, in combination, a motor having a variable stroke; a retarding device comprising a cylinder having a by-pass connecting the ends of its chamber, a valve in the by-pass, and a piston reciprocating in the cylinder and operatively connected with the motor; adjustable operative connection between the motor and the by-pass valve; and means for varying the motor-stroke and maintaining uniform throw of the by-pass valve.

4. In power-actuated set-works for sawmills, in combination, a'lnotor; a retarding device comprising a cylinder, a piston movable in the cylinder and a by-pass around the piston; a rock-valve controlling the bypass; operative connection between the motor and the piston of the retarding device;

an oscillating arm actuated by the motor;l

link connection between the arm and valve; and means for relatively shifting the center of oscillation of the arm and the point of attachment thereto of the link connecting said arm.

5. In a power-actuated set-works for sawmills, in combination, a motor; a retarding device comprising a cylinder, a piston Working therein, a by-pass connecting the two ends of the cylinder-chamber, and a valve in the by-pass; operative connection between the motor andthe piston of the retarding de-` vice; a movable positive stop for the motor; an oscillating arm driven by the motor; connection between the arm and the by-pass valve; and means actuated by the positive stop for relatively changing the center of os'- cillation of the arm and the point of vattachment theretor of'the means connecting such arm with the valve.

6. In a power-actuated set-works for sawmills, in combination, a motor-cylinder and a retarding-cylinder each having a reciprocating piston; connection between such pistons; a by-pass connecting the ends of the retarding-cylinder chamber; a valve in said by-pass; a cross-head driven by the piston of the motor-cylinder; an arm pivotally attached to the cross-head and in sliding engagement with its pivot; a stop-lever; a second arm oscillating upon a fixed pivot and in pivotal engagement with l[he first-mentioned arm; and a block slidable upon the second arm and pivotally attached to the stop-lever.

RUBEN F. BARKER.

Witnesses:

GEo. G. GREENE,v ALICE M. I-IAWLEY.

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